T-Redline™ - Natural Testosterone Support - 120 Capsules, 30-Day Supply

The Only Clinically-Backed, Natural Testosterone Support You’ll Ever Need

Testosterone fuels far more than just muscles and male drive—it’s the biological engine behind your energy, focus, strength, resilience, and confidence.

T-REDLINE™ is formulated to support each of these critical systems.

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U.S. Nutritional Scientist Formulated

Partnered With Leading Researchers & Institutions

Third-Party Lab Tested

U.S. Independent Lab Test For Purity and Toxins

Made in USA

Manufactured in FDA-Registered and Audited Facility

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Results or We Make It Right. No Excuses.

Relentless

In Pursuit of Science-Backed Solutions for Peak Masculinity

For the Few Who Never Settle

Welcome to the MANFUELED Brotherhood.
Here to Push You Further—and See You Win

16,000+ Daily Users
Testosterone Decline is REAL. T-REDLINE made me realize how much low testosterone was holding me back. I feel stronger, more energized, and like my confident self again.

~Tyler K., 54

150+ clinical studies

supporting ingredients efficacy

100%

natural ingredients

$2

per day investment in your health

Real strength comes from rising stronger after every fall.

Trusted by Over 16,000+ Men

Mike, 38

  • "This is the first male supplement that actually delivered. Energy and focus? Next level."

Joshua, 44

"T-REDLINE changed the game for me. More energy, better workouts, and my confidence is back."

John, 42

"My energy’s through the roof, and I feel unstoppable."

Your Questions Answered

Scientific References by Ingredient

Vitamin D3

Clinical Link Between Vitamin D and Testosterone:


(2011). Effect of vitamin D supplementation on testosterone levels in men.

Hormone and Metabolic Research, 43(3):223–225.

https://pubmed.ncbi.nlm.nih.gov/21154195

→ Found that men with low vitamin D levels experienced a significant increase in testosterone after supplementation.

Magnesium

Magnesium and Testosterone Production:


(2011). Effect of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion.

Biological Trace Element Research, 140(1):18–23.

https://pubmed.ncbi.nlm.nih.gov/20190350

→ Showed that magnesium supplementation increased testosterone levels, especially in active individuals.

Zinc

Zinc and Male Fertility / Hormonal Function:


(2016). Zinc levels in seminal plasma and their correlation with male infertility: A systematic review and meta-analysis.

Scientific Reports, 6, 22386.

https://doi.org/10.1038/srep22386


(2018). Zinc is an Essential Element for Male Fertility.

Journal of Reproduction & Infertility, 19(2):69-81.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6010824


(1989). Zinc: an inhibitor of prolactin (PRL) secretion in humans.

Hormone and Metabolic Research, 21(4):203–206.

https://pubmed.ncbi.nlm.nih.gov/2548734

→ Zinc may support healthy testosterone by reducing prolactin.

Fadogia Agrestis


(2005). Effects of Fadogia agrestis stem extract on male reproductive functions in rats.

Asian Journal of Andrology, 7(4):399–404.

https://pubmed.ncbi.nlm.nih.gov/16065397

→ Indicated testosterone elevation and increased libido behavior in rodents.


(2021). 20-Hydroxyecdysone, from Plant Extracts to Clinical Use.

Biomedicines, 9(5):492.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8144247

→ Explores ecdysteroids in herbs like Fadogia for neuromuscular and anabolic benefits.

Tongkat Ali

Testosterone and Libido Support:


(2010). Eurycoma longifolia Jack in managing idiopathic male infertility.

Evidence-Based Complementary and Alternative Medicine, 2012:429268.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3669033



https://examine.com/supplements/tongkat-ali/faq/does-tongkat-ali-increase-testosterone-levels

→ Confirms clinically validated increases in testosterone and reduced cortisol.



https://www.raysahelian.com/tongkat_ali.html

→ Summary of clinical studies showing testosterone, libido, and muscle strength improvements.

Ashwagandha

Muscle Strength, Testosterone, Libido, and Stress:


(2013). Clinical Evaluation of Ashwagandha in Oligospermic Males.

Evidence-Based Complementary and Alternative Medicine, 2013:571420.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4266739

→ Increased testosterone, sperm count, and motility.


(2017). Body Weight Management in Adults Under Chronic Stress Through Ashwagandha.

J Evid Based Complementary Altern Med., 22(1):96–106.

https://pubmed.ncbi.nlm.nih.gov/27576116

→ Reduced cortisol and supported weight control.


(2022). Effect on well-being and sexual performance in adult males.

Health Science Reports, 5(4):e741.

https://onlinelibrary.wiley.com/doi/full/10.1002/hsr2.741



https://ksm66ashwagandhaa.com/ksm-66/what-is-ksm-66

Boron

Testosterone & Hormonal Health:


(2011). Daily vs. weekly boron supplementation: Effects on steroid hormones and cytokines.

J Trace Elem Med Biol., 25(1):54–8.

https://pubmed.ncbi.nlm.nih.gov/21129941

→ Increased free testosterone and reduced estradiol and inflammatory markers.


(2015). Nothing boring about boron.

Integrative Medicine, 14(4):35–48.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4712861

→ Comprehensive review of boron’s impact on testosterone, bone health, and cognition.